JPS62125297A - Device for uniformly distributing cleaning balls - Google Patents

Abstract

PURPOSE:To make it possible to uniformly exfoliate to clean impurities of respective cooling water pipe groups of a heat exchanger by providing turning flow forming plates in pipelines through which a fluid containing therein cleaning balls is caused to flow, and also providing a rise-up pipe at the branching part of said pipelines located on the downstream of the turning flow forming plates. CONSTITUTION:In a pipeline as a circulation path 5, an intermediate partition plate 21 substantially forming a pentagon is provided upright so that it forms two flow passages 24 and 25. In said pipeline 5 striding over the downstream side of the intermediate partition plate 21, respective turning flow forming plates 22 and 23 each forming a semielliptical shape are inclined at an angle theta of inclination so that both plates 22 and 23 intercross both said flow paths 24 and 25. Further, at a branching part 6 of said pipeline 5 on the downstream side of both turning flow forming plates 22 and 23, branch pipes 5a and 5b are provided. One of the branch pipe 5a forms a rise-up pipe, and further is connected to an inlet water chamber of a condenser 8. While turning in right-handed rotation, the fluid is shifted to the branching part 6 where said rise-up pipe 5a is located. Hence, cleaning balls which are contained in the fluid are rotate in a spiral manner are shifted to the rise-up pipe 5a provided upright in the branching part 6, and on the other hand, cleaning balls advancing straight are moved to the branch pipe 5b.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an apparatus for evenly distributing cleaning balls for cleaning and cleaning contaminants from shell-and-tube heat exchangers, such as condensers in steam turbine plants, for example.

[Technical field of invention]

In general, multi-tube heat exchangers that use seawater as cold water, which are used in steam turbine plants used in thermal power plants and nuclear power plants, are susceptible to foreign matter and contaminants from shellfish and seaweed in the seawater. The heat exchange efficiency of the cooling pipes may be reduced, and corrosion or leakage may occur in the cooling pipes.

Therefore, as a technical means to prevent these situations, (1)
), backwashing means using cooling water using an ice chamber communication valve, and (2)
, a cleaning ball means is adopted.

That is, the cooling water backwashing means using the ice chamber communication valve described in (1) above is constructed as shown in FIG. 9.

In Figure 9, seawater flowing in from intake pipe 1 flows through circulation 11.
Cooling water (seawater) pumped up by the pump 2 and fed under pressure from the circulating water pump 2 is transferred to a pump outlet valve 3 and a cleaning ball injector 4 of the cleaning ball. However,
This cooling water is transferred to the circulation path 5, and at the branch section 6 provided on the upstream side of this circulation path 5, the cooling water is transferred to branch paths 5a and 5b.
The flow is divided into two directions. The cooling water in the branch 5a separated by this step is transferred from the condenser valve 7a to the inlet water chamber 8a of the condenser 8.
supplied to The cold fJ1 water led to the inlet water chamber 8a exchanges heat with the steam of the condenser 8 by flowing through one cooling pipe group 8b of the condenser 8, and then flows through the condenser 8.
From the outlet ice chamber 8C to the drain pipe 9 (outlet valve 10 installed in q)
a and the ball collector 11 and are drained to the sea.

On the other hand, the cold fJI of the branch path 5b branched off at the branch section 6
Water is supplied to the inlet water chamber 8 of the condenser 8 from the condenser population valve 7b.
d. The cooling water led to this inlet water chamber 8d flows through the other cooling pipe group 8e of the condenser 8, thereby exchanging heat with the steam of the condenser 8, and then the outlet ice chamber 8r of the condenser 8. The water is drained into the sea through the outlet valve 10b of the branch 5a, which is connected to the drain pipe 9 and equipped with the closed on-off valve 12a, and the ball collector 11.

In addition, each on-off valve 12a of each side passage connecting each inlet water chamber 8a, 8d and each outlet water chamber 8c, 8f of the condenser 8,
The valve 12b is opened to supply cooling water to the condenser 8 during backwashing.

On the other hand, as shown in FIG. 9, the ball cleaning means (2) above drives the circulating water pump 2 after fully opening the pump outlet valve 3 and each condensate inlet valve 7a, 7b in advance. Then, as described above, the cooling water is introduced from the water intake pipe 1 to the condenser 8.

On the other hand, the cleaning ball injector 4 and the ball collector 11
Fully open each of the on-off valves 14 and 15 of the side passage 13 that connects the
The ball circulation pump 16 provided in this side passage 13 is driven, whereby the cleaning balls (also referred to as taproge balls) in the ball recovery device 17 of this side passage 13 are supplied to the circulation passage 5 through the cleaning ball injector 4, as described above. By passing through each cold fJl pipe group 3a, 8b of the condenser 8 together with the cooled water, the contaminants in the pipes are stripped and washed, and then the cleaning balls are collected by the ball collector 11. The balls are collected and transferred to the ball collecting device 17 in the side path 13 again.

Note that the cooling water that has been cleaned is discharged eastward from the drain pipe 9 to the sea.

In particular, this type of counterflow type condenser (shell-and-tube heat exchanger) 8
In order to reduce the number of cleaning ball injectors 4 and ball collectors 11 used, simplify the piping system, and downsize the ball circulation pump by shortening the piping length, we have developed a cleaning ball injection i! i4 and the ball collector 11 are installed closer to the sea than the branching part 6 or the confluence part 18 of the branch road 5a. Furthermore, since the condenser 8 occupies the largest volume in the turbine building, it is piped as shown in FIGS. 10 and 11, thereby shortening the length of the piping and increasing the In order to effectively utilize the space around the water container 8, the circulation path 5 is connected to the inlet water chamber 8a of the condenser 8 through a branch 5a serving as a riser pipe in the branch section 6.

In addition, the above-mentioned cleaning balls are mixed with seawater and each inlet water 98
In order to uniformly supply cooling pipes 8b and 8e from a and 8b to clean them evenly, a material having a specific gravity of about 1.1 is used.

[Problems with back m technology]

However, the above-mentioned cleaning ball means uses cleaning balls mixed in the cooling water at the branch section 6 to each branch path 5a, 5b.
Theoretically, the water is taken separately and flows into each inlet water chamber 8a, 8d, but in reality, the branch part 6
Since the water is supplied to the inlet water chamber 8a through the branch pipe 5a formed by the riser pipe, the cleaning balls mixed with the cooling water pass through both the branch pipes 5a, 5b to the respective inlet water chambers 5a, 5d. The water is not evenly distributed to the cooling water pipe groups 8b and 8e, causing uneven cleaning in each cooling water pipe group 8b and 8e.
, 8e is difficult to uniformly remove and clean.

[Purpose of the invention]

In order to solve the above-mentioned difficulties, the present invention provides a swirling flow to the cleaning balls mixed in the chilled water using a swirling flow forming plate installed in the pipe, and also provides a swirling flow to the cleaning balls mixed in the chilled water using a swirling flow forming plate provided in the pipe, and The purpose of this invention is to provide an even distribution device for cleaning balls, the purpose of which is to evenly distribute and supply contaminants to each group of cooling water pipes of a heat exchanger such as a condenser and to uniformly remove and clean contaminants. .

[Essentials of invention]

The present invention provides a swirling flow forming plate in a pipe through which a fluid mixed with cleaning balls flows, and a riser pipe is installed at a branch of the pipe downstream of the swirling flow forming plate to spread the washing balls evenly. It is structured so that it is distributed to

[Embodiments of the invention]

Hereinafter, the present invention will be described with reference to an illustrated embodiment.

It should be noted that the present invention will be explained by assigning the same reference numerals to the same constituent members as in the above-mentioned simple example.

In FIG. 1, seawater flows in from a water intake pipe 1, cooling water (seawater) is pumped from a circulating water pump 2, and is transferred to a pump outlet valve 3 and a cleaning ball injector 4 of a cleaning ball.

Therefore, this cooling water is transferred to the circulation path 5 [However, at a branch 6 provided on the upstream side of this circulation path 5, it is transferred to two directions of branch paths 5a and 5b by vertical pipes. Diverted.

On the other hand, the cleaning ball injector 4 and the ball collector 11
Fully open each of the on-off valves 14 and 15 of the side passage 13 that connects the
The ball circulation pump 16 provided in this side passage 13 is driven, whereby the cleaning balls in the ball collector 17 of this side passage 13 are passed through the cleaning ball injector 4 into the circulation passage 5.
The water is supplied to the cooling water, mixed with the cooling water, and divided into two directions through the branching section 6 into the branch passages 5a and 5b. The cooling water mixed with the cleaning balls in the branch path 5a by the riser branched in this step is transferred from the condenser valve 7a to the inlet water chamber 8a of the condenser 8.
supplied to The cleaning ball cooling water led to this inlet water chamber 8a flows through one cooling pipe group 8b of the condenser 8 to strip and clean the impurities accumulated on the pipe wall, and then the condenser The water is drained from the outlet water chamber 80 of No. 8 to the sea through the outlet valve 10a attached to the drain pipe 9 and the ball collector 11. Further, the cleaning balls collected by the ball collector 11 can be recycled after being collected by the ball collector 17 in the side path 13.

On the other hand, the cleaning ball and cold water in the branch 5b branched off at the branch 6 is supplied to the inlet water chamber 8d of the condenser 8 from the condenser artificial valve 7b. The cleaning ball cooling water guided to this inlet water chamber 8d is transferred to the other cooling pipe group 8e of the condenser 8.
The contaminants accumulated on the pipe wall are removed and washed, and then the outlet valve 10b of the branch 5a connected to the drain pipe 9 from the outlet water chamber 8f of the condenser 8 and the ball collector 11 is discharged into the sea through the

In addition, each on-off valve 12a of each side passage connecting each inlet water chamber 8a, (36) and each outlet water chamber 8c, 8f of the condenser 8
, 12b are closed.

On the other hand, as shown in FIG. 2 to FIG.
Cleaning ball equal distribution device 2 constituting the main part of the present invention
0 is placed.

That is, in FIGS. 2 to 5, inside the pipe as the circulation path 5, there is a partition plate 21 having a substantially pentagonal shape and two flow paths 24.
In the pipe line 5 that spans the downstream side of the partition plate 21, there are swirl flow forming plates 22 and 23 each having a semi-circular shape. Channel 24
．． 25 and are inclined at an inclination angle θ so as to intersect with each other. Further, branch pipes 5a and 5b are provided at the branch part 6 of the pipe line 5 downstream of both swirling flow forming plates 22, 23, and one of the branch pipes 5a forms a riser pipe,
Moreover, the inlet water chamber 8a of the condenser 8.

(See Figure 10).

Therefore, the cooling water (seawater) mixed with the cleaning balls of the cleaning ball injector 4 flows into the pipe serving as the circulation path 5. Then, the cleaning balls are separated and transferred to both channels 24 and 25 by the partition plate 21. Then, the separated cleaning balls are guided by both swirling flow forming plates 22, 23 and separated upward or downward. Furthermore, the double membrane circulation forming plates 22 and 23 located at the tail end of the partition plate 21
In this case, the fluid flowing upward is guided to the right side in the direction of travel, and the fluid flowing downward is guided to the left side in the direction of travel, thereby forming a spiral flow. That is, since the fluid is transferred to the branch 6 where the riser pipe 5a is located while rotating clockwise, the cleaning balls contained in the cooling water and spirally rotating are erected in the branch 6. The washing balls are transferred to the riser pipe 5a, while the cleaning balls traveling straight are transferred to the branch pipe 5b.

In this way, the cleaning ball is removed from the riser pipe 5a.
and the branch pipe 5b.

Next, another embodiment of the present invention shown in FIGS. 6 to 8 is one in which a spiral flow forming plate 26 in a spiral shape is attached to the inner circumferential wall of the pipe as the circulation path 5. The fluid flowing in a straight line is formed into a swirling flow.

(Effects of the Invention) As described above, according to the present invention, a swirl flow forming plate is provided in a pipe through which a fluid mixed with cleaning balls flows, and a branch of the pipe downstream of the swirl flow forming plate is provided. Since the standpipe is provided, not only can the cleaning balls be distributed evenly, but there is no need for a driving source, and
The composition is also r! Jg, maintenance and inspection are easy.

[Brief explanation of drawings]

FIG. 1 is a system diagram of a cleaning device for a shell-and-tube heat exchanger incorporating the cleaning ball equal distribution device according to the present invention, and FIG.
FIG. 3 is a longitudinal cross-sectional view of the same, FIG. 4 is a plan view of the same, FIG. 5 is a side view of the same, and FIG. 6 to 8 are diagrams showing other embodiments of the present invention, FIG. 9 is a system diagram of a cleaning device for a multi-tubular heat exchanger that has already been proposed, and FIG.
The figure is a perspective view of the multi-tubular heat exchanger, and FIG.
0 is an enlarged view of the chain circle Δ section in FIG. 4...Cleaning ball injector, 5...Circulation path, 5a...
・Rise pipe, 5b... Branch pipe, 8... Condenser, 11.
. . . Ball collector, 20 . . . Evenly distributing device for cleaning balls, 21 . . . Partition plate, 22. 23 . Applicant's agent Mr. Sato Figure 5 Figure 6 Figure 7 Figure 10

Claims (1)

[Claims] 1. A swirling flow forming plate is provided in a pipe through which a fluid mixed with cleaning balls flows, and a riser is provided at a branch of the pipe downstream of the swirling flow forming plate. Unique cleaning ball even distribution device. 2. An intermediate partition plate is provided in the pipeline to divide and form two flow paths, and swirl flow forming plates are provided downstream of this intermediate partition plate and are inclined to intersect with each other in both flow paths. 2. The device for evenly distributing cleaning balls as claimed in claim 1, further comprising a riser pipe provided at a branch portion of the pipe line downstream of both swirling flow forming plates. 3. The device for evenly distributing cleaning balls as set forth in claim 1, wherein the swirling flow forming plate in the conduit is formed in a spiral shape.